您有一个连接逻辑文件，但是只希望在SSD中保存键的索引，而不是二级索引。

You have a join logical file, but only want the index for the key on SSD, not the secondary indexes.

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第二级安全性让您可以创建更加复杂的数据特有的逻辑。

The second level allows you to create more complex data-specific logic.

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CHGLFM将把与连接逻辑文件有关的所有二级索引移入或移出ssd。

CHGLFM will move all the secondary indexes associated with a join logical file on or off of SSDs.

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